Autonomous organisms on our tree of life cannot be much smaller because they must contain protein-building cellular structures called ribosomes, which are each about 20 to 30 nanometers across.

 
  • 但是在我们生命活动中的有机体并没有那么小,因为我们身体里有一种结构叫做核糖体,是合成蛋白质的场所,在合成蛋白质的时候经常聚集要聚集20-30个一起工作。
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